On the assumption that the product of volume thermal expansivity and bulk modulus based on the thermodynamic approximation theory, a new equation is presented for volume thermal expansion coefficient.
Kelvin of thermodynamic temperature unit is consists of 4 dimensional space, minus 4 dimensional time and an coefficient of 22.77, its physical expression has upgraded into.
热力学温度单位开尔文是由4维空间，负4维时间和系数22.77构成的，其物理学表述升级为。
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A thermodynamic and a 2-d numerical computational model are proposed for calculating the discharge coefficient of connecting passage of swirl chamber diesel engine.